Influence of GA3 and MH and their time of spray on dry matter accumulation and growthattributes of soybean
2004
Rahman, M.S. | Abu-Tahar, N.I.M. | Karim, M.A.,Bangladesh Agricultural Univ., Mymensingh(Bangladesh). Dept. of Crop Botany
A study was conducted to investigate the effect of plant growth regulators on dry matterproduction and growth attributes of soybean. Plants of soybean Cv. PB-1 were sprayed threetimes (T1 = spray at 15 DAS, T2 = spray at 30 DAS and T3 = spray-at 45 DAS) with twoconcentrations (100 and 200 ppm) of Gibberellic Acid (GA3) and Maleic Hydrazide (MH). Theresults of the experiment revealed that significant variations exist with the time of applicationin respect of dry matter production in root, stem, leaf and total dry matter per plant andgrowth attributes like Leaf Area Index (LAI), Crop Growth Rate (CGR), Relative Growth Rate(RGR) and Net Assimilation Rate (NAR). CGR and NAR were increased up to 80 DAS andthereafter decreased due to maturity with respect of time of spray and concentration ofgrowth regulators. However, LAI and RGR were maximized at 100 and 60 DAS, respectively, T2produced the highest root, stem, leaf and total dry matter, LAI, CGR, RGR and NAR followed byT3 and T1 produced the least of them. All growth regulators had positive effect in dry matterproduction and growth of soybean over non-sprayed control plants. GA3 was more effectivethan MH. However, 100 ppm GA3 had the most regulatory effect to enhance root, stem, leaf andtotal dry matter, LAI, CGR, RGR and NAR followed by 200 ppm GA3. 200 ppm MH was leasteffective among the treatments. Interaction between T2C3 (spray at 30 DAS x 100 ppm GA3)brought about the best improvement in dry matter production and growth of soybean.
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